<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <homework
          v-for="(item, index) in goodList"
          :key="index"
          :arr="item"
          :index="index"
          @addadd="addFn"
          @desdes="desFn"
        ></homework>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ sum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import homework from "./components/hw1";
export default {
  components: {
    homework,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods: {
    addFn(index) {
      this.goodList[index].num++;
    },
    desFn(index) {
      this.goodList[index].num
        ? this.goodList[index].num--
        : this.goodList[index].num;
    },
  },
  computed: {
    sum() {
      return this.goodList
        .filter((obj) => obj.checked == true)
        .reduce((total, obj) => total + obj.num * obj.price, 0);
    },
    isAll: {
      set(val) {
        console.log(val);
        this.goodList.forEach((obj) => (obj.checked = val));
      },
      get() {
        return this.goodList.every((obj) => obj.checked == true);
      },
    },
  },
};
</script>

<style>
</style>